Update GCSE CS blog

assets/global.css

@@ -1,7 +1,9 @@
-/* change them */
 :root {
+    /* change theme */
     --mdc-theme-primary: #00adb4;
     --mdc-theme-secondary: #d84315;
+    /* ensure Bootstrap doesn't alter any font sizes set in rem */
+    font-size: initial;
 }
 
 /* implement colour theme on elements that don't have it applied by default */
@@ -11,6 +13,9 @@
 .mdc-fab {
    background-color: var(--mdc-theme-secondary);
 }
+.material-icons:hover {
+    text-decoration: none;
+}
 
 /* hide unwanted overflow from mdc-text-field :before & :after */
 .mdc-text-field-container {